Muir Island Saga
1991Chris Claremont's final X-Men story. The Shadow King possesses the inhabitants of Muir Island, turning it into a psychic fortress and pitting the X-Men against X-Factor in a mind-controlled battle. The two teams must overcome the Shadow King's influence and unite to defeat him. The event ends Claremont's legendary 16-year run and reunites the original X-Factor members with the X-Men roster.
5 core issues, 0 optional tie-ins/crossovers
The Shadow King takes control of Muir Island's residents; the X-Men are drawn in
X-Men and X-Factor clash under the Shadow King's influence
The Shadow King is defeated; the X-Men and X-Factor merge rosters; Claremont's final issue
X-Factor arrives at Muir Island and is caught in the Shadow King's trap
X-Factor joins the unified X-Men; the original five return to the fold